It always reports with

Server replied with following exception: b'[AUTHENTICATIONFAILED] Authentication Failed'

Odoo 18 CE

I mean:

• I have a custom email domain configured in icloud
• I want use one of email under this custom domain (or few of them) in Odoo (as catchall, etc..)
• But When I'm trying to use this custom email as username - it always  throws error above :(

For both when using original account email (not from custom domain) it works well. 

Hi there,

Yes — you can use your iCloud email with Odoo by configuring SMTP and IMAP properly. Here’s how:

    Use SMTP host: smtp.mail.me.com on port 587, with SSL/TLS.

    Use IMAP host: imap.mail.me.com on port 993, with SSL.

    Don’t use your normal iCloud password — create an app-specific password from your Apple ID (under Security settings).

    In Odoo, go to Settings → Outgoing Email Servers and Incoming Mail Servers (or Email aliases), and enter these credentials/settings.

    Test the connection in Odoo; if there’s “authentication failed,” double-check the app password and SSL/TLS settings.

If you tell me your Odoo version and whether you enabled 2FA on your Apple account, I can give you the exact config steps.

Hope it helps